Romans 4
18 Ref Who without reason for hope, in faith went on hoping, so that he became the father of a number of nations, as it had been said, So will your seed be.
19 Ref And not being feeble in faith though his body seemed to him little better than dead (he being about a hundred years old) and Sarah was no longer able to have children:
20 Ref Still, he did not give up faith in the undertaking of God, but was made strong by faith, giving glory to God,
21 Ref And being certain that God was able to keep his word.